SYSTEM, Journal. 11 - The University of Zambia - Institute for African Studies - P.O. Box 30900/Lusaka. Africa Development, [S. l.], v. 6, n. 4, 1981. DOI: 10.57054/ad.v6i4.3291. Disponível em: https://journals.codesria.org/index.php/ad/article/view/3291. Acesso em: 9 jun. 2025.